Spring Oscillation Problem

1. The problem statement, all variables and given/known data
A 200 gram block is attached to a spring with a spring constant of 8 N/m. The spring oscillates horizontally on a frictionless surface. Its velocity is 80 cm/s when x = - 4.2 cm.

a. What is the amplitude of oscillation?

b. What is the block’s maximum acceleration?

c. What is the block’s position when the acceleration is maximum?

d. What is the speed of the block when x = 2.5 cm?

2. Relevant equations

A= sqroot(Xo^2+(Vo^2/w^2))
amax=w^2A

3. The attempt at a solution

I tried solving for Amplitude but Xo and Vo and w are not given, i tried looking for a way to find these variables but could not find one

If it's frictionless then then total energy is constant. If you have the information of the system at one point, you can find the total energy; the maximum amplitude will occur when the kinetic energy is 0, and the energy inside the spring is at a maximum.

Yeah you'll have to convert all the units to be the same. It doesn't matter which way you go though. have you studied energy yet? I encourage (strongly) for you to double check your answers using the methodology that I explained in my first post.